Isomerization of oxime derivatives was researched in detail to find out the methods for the syn-anti isomerization of O-substituted oximes. Based on these findings were developed simple methods for the preparation of aza-heterocycles from both stereoisomers of oximes. Quinolines were synthesized from β-aryl ketone oximes by treatment with trifluoroacetic anhydride and 4-chloranil. γ,δ-Unsaturated O-methoxyacetyloximes were transformed to 2H-dihydropyrroles by reaction with methoxy-acetic acid.
Regioselective Isomerization of Terminal Alkenes Catalyzed by a PC(sp
<sup>3</sup>
)Pincer Complex with a Hemilabile Pendant Arm
作者:Sophie De‐Botton、D.Sc. Oleg A. Filippov、Elena S. Shubina、Natalia V. Belkova、Dmitri Gelman
DOI:10.1002/cctc.202001308
日期:2020.12.4
We describe an efficient protocol for the regioselective isomerization of terminal alkenes employing a previously described bifunctional Ir‐based PC(sp3)complex (4) possessing a hemilabile sidearm. The isomerization, catalyzed by 4, results in a one‐step shift of the double bond in good to excellent selectivity, and good yield. Our mechanistic studies revealed that the reaction is driven by the stepwise
Synthesis of Bicyclo[<i>n</i>
.1.0]alkanes by a Cobalt-Catalyzed Multiple C(sp<sup>3</sup>
)−H Activation Strategy
作者:Zhuo-Zhuo Zhang、Ye-Qiang Han、Bei-Bei Zhan、Sai Wang、Bing-Feng Shi
DOI:10.1002/anie.201707638
日期:2017.10.9
cobalt‐catalyzed dual C(sp3)−H activationstrategy has been developed and it provides a novel strategy for the synthesis of bicyclo[4.1.0]heptanes and bicyclo[3.1.0]hexanes. A key to the success of this reaction is the conformation‐induced methylene C(sp3)−H activation of the resulting cobaltabicyclo[4.n.1] intermediate. In addition, the synthesis of bicyclo[3.1.0]hexane from pivalamide, by a triple C(sp3)−H activation